the easiest way would be the new feature I added to 13442

in the conference profile add

<param name="conference-flags" value="wait-mod"/>

to your <profile>

and in your dialplan

<action application="set" data="conference_member_flags=moderator"/>
<action application="conference" data="1234@wideband"/>

or

<action application="conference" data="1234@wideband+flags{moderator}"/>


Don't forget the wishlist and donate button on the main site....